gnome-shell/data/theme/gnome-shell-sass/_common.scss

//This is the RIGHT PLACE to edit the stylesheet

//let's start by telling people not to edit the generated CSS:
$cakeisalie: "This stylesheet is generated, DO NOT EDIT";
/* #{$cakeisalie} */

/* Copyright 2009, 2015 Red Hat, Inc.
 *
 * Portions adapted from Mx's data/style/default.css
 *   Copyright 2009 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU Lesser General Public License,
 * version 2.1, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
 * more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

/* Global Values */

// padding, margin and spacing
$base_padding: 6px;
$base_margin: 4px;

// border radii
$base_border_radius: 8px;

// radii of things that display over other things, e.g. popovers
$modal_radius: $base_border_radius*2; // 24px

// fonts
$base_font_size: 11;
$text_shadow_color: if($variant == 'light', rgba(255,255,255,0.3), rgba(0,0,0,0.2));

// icons
$base_icon_size: 1.09em;
$large_icon_size: $base_icon_size*2; // 32px
// $base_icon_size: 16px;

// Stage
stage {
  @include fontsize($base_font_size);
  color: $fg_color;
}

/* Common Stylings */

// osd panels
%osd_panel {
  color: $osd_fg_color;
  background-color: $osd_bg_color;
  border: 1px solid $osd_outer_borders_color;
  border-radius: 999px;
  padding: $base_padding*2;
}

// Overview panels
// for the dash and workspace switcher
%overview_panel {
  color: $osd_fg_color;
  background-color: transparentize($osd_fg_color, 0.9);
}

// icon tiles
%tile {
  border-radius: $base_border_radius * 2; // 16px
  padding: $base_padding;
  spacing: $base_padding;
  border: 2px solid transparent;
  transition-duration: 100ms;
  text-align: center;
}

// dialogs
%bubble_panel {
  color: $fg_color;
  background-color: $bg_color;
  border-radius: $base_border_radius*1.25 + 1px;
  border: 1px solid $borders_edge;
}

// normal button styling
%button {
  border-radius: $base_border_radius - 2px; // 6px
  border-style: solid;
  border-width: 1px;
  font-weight: bold;
  padding: $base_padding*.5 $base_padding*4;

  @include button(normal);
  &:focus { @include button(focus);}
  &:hover { @include button(hover);}
  &:insensitive { @include button(insensitive);}
  &:active { @include button(active);}
  &:checked { @include button(checked);}
}

// buttons in dialogs/notifications
// lighter in color and have a greater radius

$bubble_button_radius:$base_border_radius*1.25;

%bubble_button {
  padding: $base_padding * 2;
  font-weight: bold !important;

  &:ltr {margin-right: 1px;}
  &:rtl {margin-left: 1px;}

  @include button(normal, $c:$bubble_buttons_color);
  &:insensitive { @include button(insensitive, $c:$bubble_buttons_color);}
  &:focus { @include button(focus, $c:$bubble_buttons_color);}
  &:hover { @include button(hover, $c:$bubble_buttons_color);}
  &:active { @include button(active, $c:$bubble_buttons_color);}
  &:checked { @include button(checked, $c:$bubble_buttons_color);}
  
  &:first-child:ltr {
    border-radius: 0 0 0 $bubble_button_radius; 
  }

  &:last-child:ltr {
    border-radius: 0 0 $bubble_button_radius 0;
    margin-right: 0 !important;
  }

  &:first-child:rtl {
    border-radius: 0 0 $bubble_button_radius 0;
  }

  &:last-child:rtl {
    border-radius: 0 0 0 $bubble_button_radius;
    margin-left: 0 !important;
  }

  &:first-child:last-child {
    border-radius: 0 0 $bubble_button_radius $bubble_button_radius !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
  }
}

// buttons on OSD elements
// that are undecorated by default and use OSD colors
%osd_button {
  @include button(undecorated);
  &:insensitive { @include button(undecorated, $tc:$osd_fg_color, $c:$osd_bg_color);}
  &:focus { @include button(focus, $tc:$osd_fg_color, $c:$osd_bg_color);}
  &:hover { @include button(hover, $tc:$osd_fg_color, $c:$osd_bg_color);}
  &:active { @include button(active, $tc:$osd_fg_color, $c:$osd_bg_color);}
  &:outlined,&:checked { @include button(checked, $tc:$osd_fg_color, $c:$osd_bg_color);}
}

/* General Typography */

%large_title {
  font-weight: 300;
  @include fontsize(24);
}

%title_1 {
  font-weight: 800;
  @include fontsize(20);
}

%title_2 {
  font-weight: 800;
  @include fontsize(15);
}

%title_3 {
  font-weight: 700;
  @include fontsize(15);
}

%title_4 {
  font-weight: 700;
  @include fontsize(13);
}

%heading {
  font-weight: 700;
  @include fontsize(11);
}

%caption_heading {
  font-weight: 700;
  @include fontsize(9);
}

%caption {
  font-weight: 400;
  @include fontsize(9);
}

%smaller {
  font-weight: 400;
  @include fontsize(8);
}

%monospace {font-family: monospace;}
%numeric { font-feature-settings: "tnum";}